Ultra-precise measurement of optical frequency ratios

Details Ultra-precise measurement of optical frequency ratios Ultra-precise measurement of optical frequency ratios

2001-08-29

arxiv.org/abs/physics/0108062v3

Physics

Optics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.88.073601

We developed a novel technique for frequency measurement and synthesis, based on the operation of a femtosecond comb generator as transfer oscillator. The technique can be used to measure frequency ratios of any optical signals throughout the visible and near-infrared part of the spectrum. Relative uncertainties of $10^{-18}$ for averaging times of 100 s are possible. Using a Nd:YAG laser in combination with a nonlinear crystal we measured the frequency ratio of the second harmonic $\nu_{SH}$ at 532 nm to the fundamental $\nu_0$ at 1064 nm, $\nu_{SH}/\nu_0 = 2.000 000 000 000 000 001 \times (1 \pm 7 \times 10^{-19})$.

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